Staybolt structure



E. I. DODDS.

STAYBOLT STRUCTURE.

APPLICATION FILED JAN.22,192|.

Patented Dec. 6, 1921.,

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naeaee a tain new and useful.lmprovements in fidtay do hereby declare the bolt Structures and l to]lowing to be a tall, clear and exact description of the invention, such as will enable others skilled in] the art to which it apper'tai'ns to malrc and use the same.

This invention relates to improvements in staybolt structures, the object being to provide a]; construction wherein the bearing member, or the part that forms a seat for bjvthe cap covering the bolt head, and it con sists in the parts and combinations of parts aswill be more :l'ully explained and pointed out intheclaimsx 1 a i p ln the accompanying drawings; Figure 1 is a vievi fin section of one embodiment of my invention and Fig. 2 is a similar view oila modified form. c

h representsthe outer sheetofthe boiler, which in Fig. 1 is shown with an opening therein having; a concave or curved wall, the curvaturebeing in the arc of a circle to permit oi the initial adj ustment oi the bolt tearin member 6. This bearingmember t; is circular in cross sect1on and has a convex outer face conformingln curvature ahdsize to the opening; in sheet 5, and is open at its outer end and providedfat its end with a restricted openings for thepassage of the bolt 8 "andfalso with an annular seat around opening 7 onwhich the head Set the bolt 8 is seated.

The inner end otthe bolt; not shown) is designedto be secured tothe inner sheet of the boilerin the well lrnown manner, and the bolthead 9 is provided with a slot 11 torthe insertion of a tool for turning thefbolt to screw the latter to the innersheet.

l Vith the Construction thus tar describech it will be seen that the bearing; member 6 can be seated in the opening in boiler sheet 5, and the bolt 8 entered and secured to the inner sheet, the bearing member 6 being; tree to turn and accommodate itself to the posi tion or inclination of the bolt 8. The hole 6 inthe sheet 5 is counterbored as at 12 to receive the flange 13 on the cap lt, and the bearing member 6 iso't such depth and size as will permit of the initial Specificationofjiiettersltatent. i

Application filed January 22, 192i.

locked in place NEW YOEJE Z, ASSIGNUR TU IELANNERY BUILT COMPANY, OF PITTQBURGH,

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Patented Dec, 6 1921.n herial he. 439,150.

adjustment above referred to without having-one edge or side thereof project above the seat 15 in the counterbore for flange 13, ot-thec'ap.

Located within the enlarged open end of the bearing member 6 is the ring 16, the ente rnaldiameter of which is slightly less thanthe internal diameter of the bearing member so as not to interfere with the normal movement of the latter. This ring is provided with a plurality of depending fingers 17 the lower ends of which are provided withhoolr shapedend or catches 18 adapted to engage the inner surface of the sheet 5 and hold the ring against outward displace ment, the fingers being of spring or bendable metal so that they will give to permit the parts to be assembled or disassembled. These fingers pass through openings 19 formed in the bearing member 6, which openings are of sutlicient size as shown, to permit the bearing member 6 to move to accommodate itself to the position of the bolt. The inner face of the ring 16 is threaded to engage an externally threaded portion '21 ot the'cap, so that when the cap isplaced in position and connected with the ring, the cap will be held in place by the catches 18 engaging the inner faceolf the boiler sheet 5.

Gaskets 22 are interposed between the flange 13 of the cap and the seat 15 of the boiler sheet 5', vand also between the said ,ilange andthe tops 01" the bearing member 6 and ring 16 to steam. i I

With this construction it will be seen that the bearing member 6 is looselymounted in its seat in the boiler sheet 5, and can be initiallyadjusted to accommodate itself to the position of the bolt 8, and is free to move slightly to compensate for unequal expansion or contraction of the inner and outer sheets after the cap has "been secured in place. The cap is held in place by the ring 16 and is preferably flush with the outer surface of the boiler sheet 5 and is in a position to support the head of the bolt under a collapsing stress on the boiler sheets.

Vl hen the cap 14c is removed for the inspection of the bolt the ring 16 drops onto the seat on the bearing member and is supported by the latter until again engaged and drawn outwardly by the cap, the screw prevent the escape of any ing action of which pulls the ring outwardly until the catches are in contact with the inner surface of the boiler sheet 5.

In-the construction shown in Fig. 2 the bearing member 6 is seated in a conical opening in the boiler sheet 5, consequently is not adjustable as in the construction previously described, and the flange 13 of the cap instead of resting in a counterbored seat in the boiler sheet, rests on the outer edge of bearing member 6 and on the top of ring 16*.

The outer face of the ring 16, which is provided with fingers 17 having catches, as in the previous construction, is beveled as shown and bears against the inner beveled face of the-bearing member 6 and is lim ited in its downward movement by such contacting beveled faces. In this construction like that shown in Fig. 1, the attachment of the flush screw cap to the ring locks the bearing member in place. I

It is evident that many slight changes might be resorted to in the relative arrangement of parts shownand described without departing from the spirit and scope of my invention hence I would have it understood that I do not wish to confine myself to the exact construction and arrangement of parts shown and described but,

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is

1. In a staybolt structure, the combination of a boiler sheet having an opening therein for a bearing member, thelatter having'a seat for a stay bolt head, an internally -threaded ring having catches passing through the bearing member to engage the inner'face of the boiler sheet, and a cap having an externally threaded portion to engage the internal threads on the'ring.

2. In a staybolt structure, the combination of a boiler sheet having an opening therein, a bearing member seated in said opening and having an internal seat for the head of a stay bolt, an internally threaded ring located within the upper end of said bearing member and provided with catches which pass throughopenings in the bearing member to engage the inner surface of the boiler sheet, and a cap having an externally threaded portion to engage the'internal threads on the ring.

In a stay bolt structure, the combination of a bearing member adapted to be seated in an opening in the boiler sheet and provided internally with a seat for the head of a stay bolt, an internally threaded ring having catches passing throu h openings in said bearing member and adhpted to engage the inner surface of the boiler sheet, and a cap having a peripheral flange to overlap said bearing member and provided with an externally threaded portion to engage the internal threads on the ring.

4. In a stay bolt structure, the combination of a bearing member having a curved outer face, a seat for a stay bolt head and a plurality of openings in its side, an internally threaded ring having catches adapted to pass through said openings in the bearing member, and a cap having a peripheral flange to overhang the upper end of the bearing member and an externally threaded part to engage the internal threads on the rlng.

5. In a stay bolt structure, the combination of a bearing member having a curved outersurface; an internal seat for the head of a staybolt and a plurality of slots, an internally threaded ring within the upper open end of said bearing member and provided with catches adapted to project through the slots in the bearing member to engage the inner surface of the boiler sheet, and a cap having a peripheral flange to engage the outer face of the boiler sheet and with a depending externally threaded part to engage the internal threads on the ring.

6. In a staybolt structure, the combination of a boiler sheet having an opening therein a bearing member seated in opening and provided internally with a seat for a stay bolt head, an internally threaded ring having a plurality of hook shaped spring fingers the latter passing through openings in the bearing member and engaging the inner surface of the boiler sheet, and a cap having a peripheral flange to rest on said sheet and provided with an externally threaded member to engage the internal threads on the ring.

In testimony whereof, I have signed this specification in the presence of a subscribing witness.

ETHAN I. DODDS.

Witness:

EDWIN SPENCER Bros. 

